What causes spasmodic dysphonia?
The cause of spasmodic dysphonia is unknown. The general medical consensus is that SD is a central nervous system disorder and a focal form of dystonia. Dystonia is the general neurological term for a variety of problems characterized by excessive contraction of muscles with associated abnormal movements and postures. Dystonia disorders are thought to originate in the area of the brain called the basal ganglia, which are that help coordinate movements of the muscles throughout the body.
